Optically powered remote sensors with timing discrimination

Details Optically powered remote sensors with timing discrimination Optically powered remote sensors with timing discrimination

1988-05-12

1989-08-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

455612, H01J 516

Patent

active

048577278

ABSTRACT:
An optically powered fiber optic sensor system having a control end sending, with a laser diode or light-emitting diode, optical power and a clock signal exclusively through an optic fiber to a sensing end having sensors, a clock signal picking-off circuit, a return signal light-emitting diode, and needed analog and digital circuitry, all energy dependent upon the optical power transmitted through the optic fiber to the control end. The optically powered sensor end is feasible because of recent advances in technology resulting in micro-powered devices such as the analog-to-digital converter, operational amplifiers, logic circuits, and other low-powered items.

REFERENCES:
patent: 4345482 (1982-08-01), Adolfsson et al.
patent: 4678905 (1987-07-01), Phillips
Ohte et al., "Optically Powered Transducer with Optical-fiber Data Link," SPIE, vol. 478, 1984, pp. 33-38, Fiber Optic and Laser Sensors II.
Bjork et al., "Optically Powered Sensors," Preprint: Jan. 1988, Optical Fiber Sensors Conference, pp. 1-4.
Oote, "Photoelectric Converter," 58-207020(A), Japanese Patent Abstracts.
Oote, "Optical Transmission System", 58-146152(A), Japanese Patent Abstracts.
Oote, "Optical Transmission System," 58-146153(A) Japanese Patent Abstracts.
Ote, "Temperature Signal Transmitter," 61-159122(A), Japanese Patent Abstracts.

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